Calibrated Anchor Chain - Determining the correct calibration

PURCHASE Calibrated Anchor Chain

6mm, 7mm, 8mm, 10mm and 13mm chain calibrated to DIN766 plus 10mm and 12mm chain calibrated to ISO

We are very keen to help so please contact us by telephone or e-mail if you are not sure which calibration you need.

Each size and calibration is available in lengths cut to order from 1 metre up to 100 metres. We can supply longer lengths on request.

If you need something that is not listed online then of course we can calculate a ‘pro rata’ price for you and sort the order out by e-mail or telephone.

The simplest way to check that you are buying the correct calibration is to take a measurement from your existing chain, providing of course that it fits correctly.

How to measure Anchor Chain

We measure 10 links because, in practice, it is difficult to measure one link accurately enough.

The links should be laid out flat and pulled tight.

Measure from the outside edge to outside edge.

Comparison of chain measurements between brands
AQUA 4 and AQUA7Titan Grade 40Lofrans Grade 40
6mm DIN766190 mm195 mm
7mm DIN766228 mm
8mm DIN766250 mm253 mm253 mm
10mm DIN766295 mm297 mm298 mm
10mm ISO315 mm316 mm318 mm
12mm ISO375 mm375 mm
5/16" US Specification AQUA4275 mm

These are Jimmy Green measurements taken from our actual stock here in Beer. Because the measurement is over 10 links there is room for a little tolerance.
If your existing chain is old and worn then the measurement over 10 links may be a little longer than Jimmy Green new stock by a small percentage.

If your chain falls between the measurement for 8mm DIN766 and 10mm DIN766, it may be 5/16" US Specification.
This is 8.7mm chain with a 26.1mm pitch:


The length for 10 links of 5/16" US will therefore be approximately 275mm-280mm (26.1 x 10 Plus 2 x 8.7 = 278.4)

If you are starting from scratch i.e. you have a windlass gypsy but no chain that fits, bearing in mind that it doesn’t matter how old and rusty it is as long as it fits, then it is more difficult but we can still help.

We can research the windlass and gypsy for you to narrow down the options and send you a short sample to lay in the pockets of the gypsy.

You can purchase 10 LINKS OF SAMPLE ANCHOR CHAIN to establish your calibration

If the sample is not conclusive we can send you a longer (returnable) length which you can rig up with some rope for a practical trial under load.

We make every possible effort to send out the correct calibration because a little time spent before despatch is much better than trying to sort out the mess afterwards if it doesn’t fit.
Chain is heavy and is clearly not only expensive but also tiresome to move around unnecessarily.

Carriers also make a surcharge for collection so that returning heavy parcels becomes even more expensive than the original carriage cost.

Customers should be aware that once we have cut a piece of chain (or rope for that matter) to length for you then the ‘distance rules for selling’ do not apply so it’s best not to leave anything to chance.
Essentially, this means that if you have made a mistake with your order then you are not entitled to a refund.
Under our returns policy you would be offered a credit or partial credit against your return of the goods.

If you are exchanging or better still upgrading in the process it will certainly help your case regarding the credit allowable.
N.B. this does not affect your statutory rights. If we have made an error on your order and sent the wrong goods or the goods we have sent are faulty, then you are, of course, entitled to a refund.

Dimensions for individual links of calibrated chain. CALIBRATED ANCHOR CHAIN - DIMENSIONS